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Rudenkoite: Sr3Al3[(Si,Al)4O10](OH,O)8Cl2·H2O
Comments: White fragment of rudenkoite embedded in epoxy, co-type material. Location: 80 km SEE of Aldan, Yakutia, Russia. Scale: See Image. © Rruff Database
Sadanagaite: (K,Na)Ca2(Fe++,Mg,Al,Ti)5[(Si,Al)8O22](OH)2
Comments: Heavy mineral concentrate of black to dark brown grains showing strong pleochroism. Location: Ilmen Mts, Chelyabinsk Oblast', Urals Region, Russia. Scale: See Image. © Rruff Database
Sakhaite: Ca3Mg(BO3)2(CO3)·0.36(H2O)
Comments: Dark gray octahedron of sakhaite embedded in gray calcite. Location: Titovskoe, Sakha (Yakutia) Republic, Russia. Scale: See Image. © Rruff Database
Sarcolite: NaCa6Al4Si6O24F (?)
Comments: Rounded colorless sarcolite crystals associated with orange gehlenite and black augite. Location: Monte Somma, Vesuvius, Italy. Scale: See Image. © Rruff Database
Scotlandite: PbSO3
Comments: Radiating group of colorless spear-head shaped prismatic crystals of scotlandite. Location: Lady Anne Hopetoun shaft. Leadhills, Lanarkshire, Scotland. Scale: See Image. © Rruff Database
Shandite: Pb2Ni3S2
Comments: Bright silver metallic shandite blebs in serpentinite, chonchoidal fracture. Location: Nickel Reward mine, Tasmania, Australia. Scale: See Image. © Rruff Database
Stannite: Cu2FeSnS4 Volfsonite: Cu+10Cu++Fe++Fe+++2Sn++++3S16
Comments: Bluish-black octahedron of stannite (also known as volfsonite). Location: Yaogangxian Wolfram mine, Yizhang County, Hunan Province, China. Scale: See Image. © Rruff Database
Stenhuggarite: CaFe+++(As+++O2)(As+++Sb+++O5)
Comments: Aggregate of reddish orange granular stenhuggarite crystals in matrix of black hematite. Location: Langban, Filipstad, Varmland, Sweden. Scale: See Image. © Rruff Database
Strakhovite: NaBa3(Mn++,Mn+++)4Si6O19(OH)3
Comments: Dark green vitreous massive strakhovite with inset image of sample. Location: Dzhavodi Area, Ir-Nimi manganese deposit, Taikan Ridge, Khabarovskiy Kray, Far-Eastern Region, Russia. Scale: See Image. © Rruff Database
Strelkinite: Na2(UO2)2V2O8·6(H2O)
Comments: Yellow massive strelkinite. Location: Basaral occurrence, southwest Balkhash region, Kazakhstan. Scale: See Image. © Rruff Database